What is the difference between 'open-ended' and 'closed-ended' questions in surveys?
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A
Open-ended questions are longer; closed-ended questions are shorter
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B
Open-ended questions allow free-form responses; closed-ended questions provide fixed response options
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C
Open-ended questions are used only in qualitative research; closed-ended only in quantitative research
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D
Open-ended questions have no correct answers; closed-ended questions have exactly one correct answer